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Allowance for Credit Losses (Tables)
 6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Summary of Allowance for Credit Losses
The following table summarizes the allowance for credit losses at June 30, 2017 and December 31, 2016: 
 
June 30,
2017
 
December 31,
2016
 
(in thousands)
Components of allowance for credit losses:
 
 
 
Allowance for loan losses
$
116,446

 
$
114,419

Allowance for unfunded letters of credit
2,175

 
2,185

Total allowance for credit losses
$
118,621

 
$
116,604
Summary of Provision for Credit Losses
The following table summarizes the provision for credit losses for the periods indicated:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Components of provision for credit losses:
 
 
 
 
 
 
 
Provision for loan losses
$
3,710

 
$
1,363

 
$
6,112

 
$
2,092

Provision for unfunded letters of credit
(78
)
 
66

 
(10
)
 
137

Total provision for credit losses
$
3,632

 
$
1,429

 
$
6,102

 
$
2,229
Summary of Activity in Allowance for Loan Losses
The following table details activity in the allowance for loan losses by portfolio segment for the three and six months ended June 30, 2017 and 2016:
 
Commercial
and Industrial
 
Commercial
Real Estate
 
Residential
Mortgage
 
Consumer
 
Total
 
(in thousands)
Three Months Ended
June 30, 2017
 
 
 
 
 
 
 
 
 
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
Beginning balance
$
51,288

 
$
56,302

 
$
3,592

 
$
4,261

 
$
115,443

Loans charged-off
(2,910
)
 
(139
)
 
(229
)
 
(1,011
)
 
(4,289
)
Charged-off loans recovered
312

 
640

 
235

 
395

 
1,582

Net (charge-offs) recoveries
(2,598
)
 
501

 
6

 
(616
)
 
(2,707
)
Provision for loan losses
2,927

 
(1,348
)
 
588

 
1,543

 
3,710

Ending balance
$
51,617

 
$
55,455

 
$
4,186

 
$
5,188

 
$
116,446

Three Months Ended
June 30, 2016
 
 
 
 
 
 
 
 
 
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
Beginning balance
$
48,417

 
$
48,454

 
$
4,209

 
$
4,335

 
$
105,415

Loans charged-off
(493
)
 
(414
)
 
(151
)
 
(697
)
 
(1,755
)
Charged-off loans recovered
990

 
1,458

 
94

 
523

 
3,065

Net recoveries (charge-offs)
497

 
1,044

 
(57
)
 
(174
)
 
1,310

Provision for loan losses
(889
)
 
2,379

 
(657
)
 
530

 
1,363

Ending balance
$
48,025

 
$
51,877

 
$
3,495

 
$
4,691

 
$
108,088


 
Commercial
and Industrial
 
Commercial
Real Estate
 
Residential
Mortgage
 
Consumer
 
Total
 
(in thousands)
Six Months Ended
June 30, 2017
 
 
 
 
 
 
 
 
 
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
Beginning balance
$
50,820

 
$
55,851

 
$
3,702

 
$
4,046

 
$
114,419

Loans charged-off
(4,624
)
 
(553
)
 
(359
)
 
(2,132
)
 
(7,668
)
Charged-off loans recovered
1,160

 
782

 
683

 
958

 
3,583

Net (charge-offs) recoveries
(3,464
)
 
229

 
324

 
(1,174
)
 
(4,085
)
Provision for loan losses
4,261

 
(625
)
 
160

 
2,316

 
6,112

Ending balance
$
51,617

 
$
55,455

 
$
4,186

 
$
5,188

 
$
116,446

Six Months Ended
June 30, 2016
 
 
 
 
 
 
 
 
 
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
Beginning balance
$
48,767

 
$
48,006

 
$
4,625

 
$
4,780

 
$
106,178

Loans charged-off
(1,744
)
 
(519
)
 
(232
)
 
(1,771
)
 
(4,266
)
Charged-off loans recovered
1,516

 
1,547

 
109

 
912

 
4,084

Net (charge-offs) recoveries
(228
)
 
1,028

 
(123
)
 
(859
)
 
(182
)
Provision for loan losses
(514
)
 
2,843

 
(1,007
)
 
770

 
2,092

Ending balance
$
48,025

 
$
51,877

 
$
3,495

 
$
4,691

 
$
108,088
Summary of Allocation of Allowance for Loan Losses and Related Loans by Loan Portfolio Segment Disaggregated Based on Impairment Methodology
The following table represents the allocation of the allowance for loan losses and the related loans by loan portfolio segment disaggregated based on the impairment methodology at June 30, 2017 and December 31, 2016. 
 
Commercial
and Industrial
 
Commercial
Real Estate
 
Residential
Mortgage
 
Consumer
 
Total
 
(in thousands)
June 30, 2017
 
 
 
 
 
 
 
 
 
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
Individually evaluated for impairment
$
6,746

 
$
2,969

 
$
582

 
$
51

 
$
10,348

Collectively evaluated for impairment
44,871

 
52,486

 
3,604

 
5,137

 
106,098

Total
$
51,617

 
$
55,455

 
$
4,186

 
$
5,188

 
$
116,446

Loans:
 
 
 
 
 
 
 
 
 
Individually evaluated for impairment
$
60,237

 
$
66,016

 
$
16,189

 
$
3,551

 
$
145,993

Collectively evaluated for impairment
2,357,687

 
8,960,415

 
2,553,311

 
2,151,885

 
16,023,298

Loans acquired with discounts related to credit quality
213,388

 
1,085,156

 
155,277

 
87,648

 
1,541,469

Total
$
2,631,312

 
$
10,111,587

 
$
2,724,777

 
$
2,243,084

 
$
17,710,760

December 31, 2016
 
 
 
 
 
 
 
 
 
Allowance for loan losses:
 
 
 
 
 
 
 
 
 
Individually evaluated for impairment
$
5,864

 
$
3,872

 
$
725

 
$
70

 
$
10,531

Collectively evaluated for impairment
44,956

 
51,979

 
2,977

 
3,976

 
103,888

Total
$
50,820

 
$
55,851

 
$
3,702

 
$
4,046

 
$
114,419

Loans:
 
 
 
 
 
 
 
 
 
Individually evaluated for impairment
$
30,640

 
$
62,289

 
$
18,356

 
$
3,534

 
$
114,819

Collectively evaluated for impairment
2,326,378

 
8,276,305

 
2,665,839

 
2,081,260

 
15,349,782

Loans acquired with discounts related to credit quality
281,177

 
1,206,019

 
183,723

 
100,583

 
1,771,502

Total
$
2,638,195

 
$
9,544,613

 
$
2,867,918

 
$
2,185,377

 
$
17,236,103